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https://issues.apache.org/jira/browse/HADOOP-2385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12559140#action_12559140
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Doug Cutting commented on HADOOP-2385:
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> I would prefer creating new classes solely dedicated to configuration logic [
> ... ]
I think this varies, case-by-case. For a complex subsystem like HDFS, it may
make sense to have dedicated configuration classes. For a standalone classes,
like an InputFormat or compression codec, it probably makes sense to put
configuration accessors directly on the class in question.
> Validate configuration parameters
> ---------------------------------
>
> Key: HADOOP-2385
> URL: https://issues.apache.org/jira/browse/HADOOP-2385
> Project: Hadoop
> Issue Type: Improvement
> Components: dfs
> Affects Versions: 0.16.0
> Reporter: Robert Chansler
>
> Configuration parameters should be fully validated before name nodes or data
> nodes begin service.
> Required parameters must be present.
> Required and optional parameters must have values of proper type and range.
> Undefined parameters must not be present.
> (I was recently observing some confusion whose root cause was a mis-spelled
> parameter.)
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